[Huusker]

Tons and tons of prior art. Even the web itself (the ETag header) See HTTP 1.1 specification.

Of course prior art often doesn't mean jack to those idiots at the USPTO.

[FoxPro]

Is there any written descriptions for this, in regards specifically to backup, prior to April 2000? If there is, it should render the patent null and void. Is this crazy, or what?